US349362A - Stop mechanism for driving-shafts - Google Patents

Description

(No Model.)

F. M. ROOTS.

STOP MECHANISM FOR DRIVING SHAFTS.

Patented Sept. 21, 1886.

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UNITED STATES PATENT OFFICE.

FRANCIS M. ROOTS, OF OONNERSVILLE, INDIANA.

STOP MECHANISM FOR DRlVlNG-SHAFTS.

SPECIFICATION forming part of Letters Patent No. 349,362, dated September 21, 1886.

Application filed January 19, ISEG. Serial No. 189,058. No model.)

To all whom it may concern:

Be it known that I, FRANCIS M. ROOTS, a citizen of the United States, and a resident of Gonnersville, in the county of Fayette and State of Indiana, have invented a certain new and useful Improvement in Stop Mechanisms for Driving-Shafts, of which the following is a specification.

The object of myinvention is to provide a simple, positive, and reliable stop to prevent driving-shafts from turning backward.

My invention is especially applicable to hand-blowers for forges, 850., to prevent the backward motion of the pistons, which would draw ashes, cinders, or gases into the blowercase. These ashes and cinders cut and injure the contact-surfaces, and the gases frequently cause explosions which destroy the blowers.

The invention is also applicable to various devices in place of the ratchet and pawl generally used, and has the advantage of insuring an instantaneous stop and preventing the slightest backward movement.

\Vith this object in view my invention 0011 sists in arranging a vibrating arm, which is pivoted to a stationary object outside the axis of rotation, the end of the arm bearing upon a flange 0r rim of the driving-wheel, or a wheel mounted upon the driving-shaft, the said arm,when resting upon the rim or flange, being at an angle to aradial line drawn through its pivot.

It also consists in certain details of construction and combination of parts, all of which will be fully described in connection with the accompanying drawings, in which like parts are indicated by similar referenceletters wherever they occur in the various views, and particularly referred to in the claims.

In the accompanying drawings, Figure 1 is a side elevation of my improvement as applied to one of my blacksmiths blowers. Fig. 2 is a vertical section of the same through line no as of Fig. 1, looking in the direction of the blower, which in this view is removed.

To the top of the blower-case A is secured the arm B, which carries at its upper end the j ournal-pin 0, upon which the driving sprocket-wheel D is mounted.

The construction of the blower and sprockets and chain for driving the same is well known, and is therefore not specifically described herein, except in so far as is necessary to a clear understanding of my stop devices. 1

To the standard B is loosely pivoted a swinging arm, E, which drops down at an angle to a radius drawn through the pivot upon which the arm E is journaled. The lower end of this arm rests upon a flange, a, which projects out from one side of the driving-wheel D. This flange is shown in dotted line in Fig. 1 of the drawings. The lower end of the arm E is provided with a transverse dovetail groove, within which is compressed a shoe of hard rubber, wood, leather, or other suitable noiseless material, which rests upon the flange.

The direction of the wheel is indicated by an arrow. It will be seen that while the arm E in no way interferes with the free rotation of the wheel in its proper direction, and will be noiseless when the wheel is so revolved, it will yet absolutely prevent any backward movement. \Vhen the blower is driven by a belt instead of the sprocket-chain, as shown in the drawings, the arm E will rest upon the rim of the pulley. The pulley in this case would require nochange whatever; but when the sprocket-wheel is used the flange a is necessary.

It is obvious that the stop-arm E, instead of being pivoted to the standard or arm which supports the driving-wheel, may be pivoted to any stationary object, and it is immaterial whether it depends, as shown in the drawings, or inclines above its pivot-pin, so longas it is at such an angle to the radius as to permit the free rotation of the wheel in one direction and instantly arrests it when attempted to be moved in the other direction.

I am aware it is not broadly new to provide brake mechanism to prevent wheels and shafts from turning backward.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination, substantially as specified, of the standard 13 and wheel D, mounted upon the pin 0 in said standard, the said wheel having a flange, c, with the arm E, pivoted to said standard B, and having its free end as shown and described.

2. The combination, substantially as specified, of the driving-Wheel D, having flange a, 5 the arm E, pivoted on a stationary object at \Vitnesses:

resting on the flange of wheel D, substantially I vided at its free end with a dovetail groove,

and a friction-shoe held within said groove, for the purpose set forth.

FRANCIS l\l.. ROOTS.

one end and having its opposite end in proximity to the flange, the said arm E being pro- GEo. J. MURRAY, EDGAR OITAIR.

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